Sharpening-machine for drill-bits.



No. 692,796. Patented Feb. 4,1902.

T. H. PRDSKE. SHARPENING MACHINE FOB DRILL BITS.

(Application flld Aug. 14, 1901.)

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(No Model.)

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THEODORE l-I. PROSKE, or VICTOR, COLORADO.

SHARPENlNG-MACHINE FO'R DRILL-BITS.

SPECIFICATION forming part of Letters Patent No. 692,796, dated February 4, 1902- Application filed August 14,1901- Serial No. 71,996. (No model.)

To all whom it may concern:

Beit known that LTHEODORE H. PROSKE, a citizen of the United States, and a resident of Victor, in the county of Teller and State of Colorado, have invented a new and Improved Sharpening-Machine for Drill-Bits, of which the following is a full,'clear,'and exact description.

The Object of the invention is to provide a new and improved sharpening-machine for quickly and accurately fashioning and sharpening the bits of machine-drills and other drills, the sharpening-machine being simple and duable in construction, not liable to get out of Order, easily manipulated, and arranged to permit sharpening of drill-bits of various sizes.

The invention consists of novel features and parts and combinations of the same, as will be fully described hereinafter and then pointed out in the claims.

A practical embodiment of the invention is represented in the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure 1 is a side elevation of the improvement with a drill in position to be sharpened. Fig. 2 is a plan view of the same with the drill shown broken out. Fig. 8 is an enlarged transverse section of the improvement on the line 3 3 in Fig. 1, showing more particularly the dies and the means for opening and closing the same. Fig. 4 is an enlarged side elevation of one of the dies and the dolly. Fig. 5 is a face view of the dolly-head. Fig. 6 is a front elevation of the trimming-machine for trimming the drill-bit previously to sharpening the same, and Fig.7 is a side elevation of the anvil and die of the trimming-machine.

The'improvedsharpening-machineismounted on a snitably-constructed frame A, supporting a guide B, upon which a dolly O is loosely mounted to slide in a longitudinal di rection, said dolly having radial wings O, terminating in a die-head C formed on its face with a central shaping part 0 and with radially-extending bevels 0 as indicated in Figs. 4 and 5. The outsides of the wings O, at the face of the dolly-head, form shears for cutting off any surplus material that may be on a wing of the drill-bit. The Outer'end of the dolly O is adapted to be engaged bya reciprocating striker,such as the drill-chuck D of a drilling-machineof any approved construction, for imparting blows to the dolly O, and thereby fashioning and sharpening the drill-bit, as hereinafter more fully described. The shank of the chuck D is mounted to slide in suitable bearings E, attached to the frame A, which latter also supports the rest of the drilling-machine. (Not shown.)

The bit F of the drill F to be fashioned or sharpened is placed in an anvil-die G, while the end of the drill-shank rests on an abutment H, mounted to slide longitudinally in suitable bearings A, carried on the frame A. The die G is preferably made in sections G G (see Fig. 3,) held in boxes G G mounted to slide transversely in guideways A attached to the frame A. The die-sections G G are preferably made square in cross-section, with part of a die on each face, and the die parts are of different sizes, so that when the sections G G are adjusted in the boxes G G the die can be used for receiving drillbits of various sizes, as will be readily understood by reference to Fig. 3. The die-sections besides forming stops for the drill-bit and part of the drill-shank (see Fig. 4) are formed at their'outer ends with bevels G 10- caled oppositely and operating, in conjunction with the bevels O on the dolly-head, to serve as acprotection for the central shaping part 0 of the dolly and to also serve as'a guide and bumper for the dolly.

The boxes G and G are engaged by screwrods I I, each havingright and left hand threads, so that upon turning said screw-rods the boxes G G are simultaneously moved toward orfrom each other to close 01' Openthe die-sections G G In order to rotate the screw-rods I I simultaneously, I provide their outer ends with pinions I I in mesh with a gear-Wheel I, mounted to rotate on a stud 1 held on the bearing A and on said gear-wheel I is secured a crank-arm 1 under the control of the operator. When the crank-arm 1' is turned in one direction, the die-sections G G are moved to open the die for the insertion of the bit, and when the crank-arm l is turned in the opposite direction the die-sections G G close to hold the bit securely in position dur- 'too ing the time the head 0 of the dolly strikes the end of the hit and fashions the same according to the die G and at the same time sharpens the edges of the bit and removes the surplus material that may be on the wings of the drill-bit. It is expressly understood that the seats in the die-sections G G have bevels G5 for engagement with the bevels C of the dolly-head to properly guide the latter to the drill-bit and to insure accurate sharpening of the latter. The bevels C" also serve to remove any surplus material that may be on the wings of the drill-bit.

The abutment H is engaged by a feed-screw I-I, journaled in suitable hearings on the frame A and carrying a bevel gear-Wheel H in mesh with a bevel gear-wheel H mounted to turn in suitable bearings arranged on the frame A, adjacent to the bearing A (See Figs. 1 and 2.) On the outer end of the shaft H is secured a crank-arm H under the control of the operator, for turning the shaft H and imparting its rotary motion by the gear wheels H 11 to the feed-screw 11, so that the abutment H is moved toward or from the die G, according to the length of the drill under treatment at the time.

Prior to fashioningand sharpening thedrill, it is necessary that the same be trimmed, and for this purpose an anvil K is provided, (see Figs. 6 and 7,) over which operates a die L, connected with the reciprocating piston-rod of a drilling-machine to move the die toward or from said anvil K and cut the drill prior to passing into the anvil-die G. It is understood that the drill is heated previously to trimming the same by the anvil K and the die L, and while it is still in a hot condition itis placed in the anvil-die and acted upon by the dolly, as previously described, to give the desired shape and sharp cutting edges to the drill-bit.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent 1. Asharpening-machine fordrillbits,comprising a die, and a dolly reciprocating toward and from said die, the die and the dolly having registering bevels to serve as a protection to the shaping part of the dolly and as a guide and bumper for the same, as set forth.

2. Asharpening-machinefordrill-bits,comprising a die provided with an operating-face bounded by angular edges, a dolly provided with an operating-face mating said face of the die, and provided further with radially-disposed wings provided with cutting edges mat; ing said angular edges of said die.

3. Asharpeningmachinefordrillbits,comprising a die provided with an operating-face bounded by angular edges, a dolly having radially-disposed wings provided with an operating-face bounded by angular edges, the arrangement being such that said operatingfaces act as formers while said angular edges have a slight shearing movement.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

THEODORE H. PROSKE.

\Vitn esses:

S. A. HALL, DANIEL ARMS. 

